POLYURETHANE MODIFIED GRAPHENE MICROSHEET AND PREPARATION METHOD THEREFOR

Provided in the present disclosure are a polyurethane modified graphene microsheet and a preparation method therefor, the preparation method specifically comprising: adding graphene oxide and polyol into a three-neck flask according to a ratio, stirring and mixing same, and carrying out high-temperature vacuum dehydration at the same time; continuously mixing and stirring same after the high-temperature vacuum dehydration is finished, stopping heating, controlling the reaction temperature, cooling to room temperature, gradually adding isocyanate, monitoring the reaction temperature, adjusting the adding rate according to the reaction temperature, and controlling the reaction temperature to be maintained below T°C; and finally, after isocyanate is added and reacted for 10-30 min, controlling the reaction temperature within a range of 75-85°C by using oil bath heating, stirring and reacting for 1.5-3 h, and filtering and packaging by using a filter screen to complete the preparation of a polyurethane modified graphene microsheet. The polyurethane modified graphene microsheet prepared in the present disclosure is used in an epoxy resin coating material, and graphene may be uniformly oriented and distributed in a coating, thus greatly improving the corrosion resistance of the coating.